Rollerball marker



FIG. 1 is a perspective view of a rollerball marker showing a first embodiment according to the present design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is an elevation view rotated one-eighth from FIG. 2;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a rear elevation view thereof.

The evenly spaced broken lines shown in the drawings are included to show portions of the rollerball marker that form no part of the claimed design.

The long and short broken lines that define the bounds of the claimed design form no part thereof. 

CLAIM The ornamental design for a rollerball marker, as shown and described. 